Nuclear transparency and effective kaon-nucleon cross section from the $A(e,e^{\prime }{K}^{+})$ reaction

Journal Article · Fri Jul 01 04:00:00 EDT 2011 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.84.015210· OSTI ID:1022070

Nuruzzaman; Dutta, D.; Arrington, J.; Asaturyan, R.; Benmokhtar, F.; Boeglin, W.; Bosted, P.; Bruell, A.; Clasie, B.; Christy, M. E.; Chudakov, E.; Dalton, M. M.; Daniel, A.; Day, D.; Fassi, L. El; Ent, R.; Fenker, H. C.; Ferrer, J.; Fomin, N.; Gao, H. ; Garrow, K.; Gaskell, D.; Gray, C.; Horn, T.; Huber, G. M.; Jones, M. K.; Kalantarians, N.; Keppel, C. E.; Kramer, K.; Li, Y.; Liang, Y.; Lung, A. F.; Malace, S.; Markowitz, P.; Matsumura, A.; Meekins, D. G.; Mertens, T.; Miyoshi, T.; Mkrtchyan, H.; Monson, R.; Navasardyan, T.; Niculescu, G.; Niculescu, I.; Okayasu, Y.; Opper, A. K.; Perdrisat, C.; Punjabi, V.; Qian, X.; Rauf, A. W.; Rodriquez, V. M.; Rohe, D.; Seely, J.; Segbefia, E.; Smith, G. R.; Sumihama, M.; Tadevosyan, V.; Tang, L.; Tvaskis, V.; Vulcan, W. F.; Wesselmann, F. R.; Wood, S. A.; Yuan, L.; Zheng, X. C.

We have determined the transparency of the nuclear medium to kaons from $$A(e,e^{'} K^{+})$$ measurements on $$^{12}$$C, $$^{63}$$Cu, and $$^{197}$$Au targets. The measurements were performed at the Jefferson Laboratory and span a range in four-momentum-transfer squared Q$^2$=1.1 -- 3.0 GeV$^2$. The nuclear transparency was defined as the ratio of measured kaon electroproduction cross sections with respect to deuterium, ($$\sigma^{A}/\sigma^{D}$$). We further extracted the atomic number ($$A$$) dependence of the transparency as parametrized by $$T= (A/2)^{\alpha-1}$$ and, within a simple model assumption, the in-medium effective kaon-nucleon cross sections. The effective cross sections extracted from the electroproduction data are found to be smaller than the free cross sections determined from kaon-nucleon scattering experiments, and the parameter $$\alpha$$ was found to be significantly larger than those obtained from kaon-nucleus scattering. We have included similar comparisons between pion- and proton-nucleon effective cross sections as determined from electron scattering experiments, and pion-nucleus and proton-nucleus scattering data.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1022070
• Report Number(s): JLAB-PHY-11-1356; DOE/OR/23177-1727; arXiv:1103.4120
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 1 Vol. 84; ISSN 0556-2813; ISSN PRVCAN
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ATOMIC NUMBER
CEBAF ACCELERATOR
CROSS SECTIONS
DEUTERIUM
ELECTRONS
ELECTROPRODUCTION
FOUR MOMENTUM TRANSFER
KAONS
SCATTERING
TARGETS